package io.renren.modules.edu.excel;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.read.listener.ReadListener;
import com.alibaba.excel.util.ListUtils;
import io.renren.modules.edu.service.EduCertificateService;

import io.renren.modules.edu.vo.CertificateVo;
import lombok.extern.slf4j.Slf4j;

import java.util.List;

@Slf4j
public class CertificateExcelVoListener implements ReadListener<CertificateVo> {
    /**
     * 每隔5条存储数据库，实际使用中可以100条，然后清理list ，方便内存回收
     */
    private static final int BATCH_COUNT = 1024;
    private List<CertificateVo> cachedDataList = ListUtils.newArrayListWithExpectedSize(BATCH_COUNT);

    private EduCertificateService eduCertificateService;

    public CertificateExcelVoListener(EduCertificateService eduCertificateService) {
        this.eduCertificateService = eduCertificateService;
    }

    public CertificateExcelVoListener() {

    }
    /**
     * 这个每一条数据解析都会来调用
     *
     * @param data    one row value. It is same as {@link AnalysisContext#readRowHolder()}
     * @param context
     */

    @Override
    public void invoke(CertificateVo data, AnalysisContext context) {
        /*log.info("解析到一条数据:{}", JSON.toJSONString(data));*/
        cachedDataList.add(data);
        // 达到BATCH_COUNT了，需要去存储一次数据库，防止数据几万条数据在内存，容易OOM
        if (cachedDataList.size() >= BATCH_COUNT) {
            saveData();
            // 存储完成清理 list
            cachedDataList = ListUtils.newArrayListWithExpectedSize(BATCH_COUNT);
        }
    }
    /**
     * 所有数据解析完成了 都会来调用
     *
     * @param context
     */
    @Override
    public void doAfterAllAnalysed(AnalysisContext context) {
        // 这里也要保存数据，确保最后遗留的数据也存储到数据库
        saveData();
        /*log.info("所有数据解析完成！");*/
    }
    /**
     * 加上存储数据库
     */
    private void saveData() {
        /*log.info("{}条数据，开始存储数据库！", cachedDataList.size());*/
        eduCertificateService.importByList(cachedDataList);
    }

}
